Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fd2df079f1510c…

MALICIOUS

PDF

68.8 KB Created: 2021-03-21 12:27:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 169df348844da5f72c709abe7e0580c4 SHA-1: bc96786b8b16cda4d571b85ca080a4569ce437e1 SHA-256: d4fd2df079f1510c820a8dbabb770f4645aa65b7f294ac2899295182097823a5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nipisod.ru/award?keyword=burrell+and+morgan+1979+book+pdf PDF link annotation
    • https://guxizipib.weebly.com/uploads/1/3/4/3/134367178/votixodilofifezev.pdfIn PDF document text
    • https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/wawilaxof.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/6406422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5fce162836558.pdfIn PDF document text
    • https://zesumijiwad.weebly.com/uploads/1/3/0/7/130739983/d7ac6a.pdfIn PDF document text
    • https://rolarijigajegij.weebly.com/uploads/1/3/1/4/131438579/gesitumuvakekivod.pdfIn PDF document text
    • https://dipidedi.weebly.com/uploads/1/3/2/8/132815933/rokur_jexab_nonax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fef0b1da0716.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/8786849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/veledabejufi/ielts_fever_reading_practice_test_11_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/sowujo.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/galaxy_s7_boot_loop_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2bececf-6a3e-4971-95fe-7368e98da62c/suzuki_cello_book_1_imslp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b5e741c-b2fb-451a-8728-bef154e530d2/fapijuxoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6919eef-bef3-418a-9eac-82a51124fead/my_hp_printer_says_black_cartridge_problem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea833d17-54ac-4523-bce2-f176950c47f9/how_to_replace_battery_in_bushnell_neo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fad1f64-ceb7-475c-b4c3-be1fc8668f73/do_i_capitalize_prepositions_in_titles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a4ccc4-a165-43df-a36c-5a3f6cf29808/what_is_link2cell_bluetooth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5deb48e0-ebf5-4750-a777-35272f259e6a/pobub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96d78ca-84c2-4d75-84f2-126cbe9b80a9/20164667981.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 5480 bytes
SHA-256: 27a2018593cb9392a95055dabe58411afce80645a20c95d919cace165525c9b4
font_01_sfnt_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 9124 bytes
SHA-256: 2a4617173aeae8cd580167b0b1921b22b27be29460f0fad1a67e412a03eae051
font_02_sfnt_off0000f7a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2